Submission #986978

#	Time	Username	Problem	Language	Result	Execution time	Memory
986978		activedeltorre	Longest Trip (IOI23_longesttrip)	C++17	70 / 100	11 ms	856 KiB

longesttrip

#include "longesttrip.h"
#include <deque>
#include <vector>
#include <algorithm>
using namespace std;
int fre[100005];
deque<int>dq1;
deque<int>dq2;
vector<int>ans1,ans2;
vector<int>raspuns;
int are_connecte(int a,int b)
{
    vector<int>pl1,pl2;
    pl1.push_back(a);
    pl2.push_back(b);
    return are_connected(pl1,pl2);
}
void solus(int kuk,int pz2)
{
    int pen,i;
    for(i=0;i<ans1.size();i++)
    {
        if(are_connecte(kuk,ans1[i]))
        {
            pen=i;
            break;
        }
    }
    for(i=pen-1;i>=0;i--)
    {
        raspuns.push_back(ans1[i]);
    }
    for(i=ans1.size()-1;i>=pen;i--)
    {
        raspuns.push_back(ans1[i]);
    }
    for(i=pz2;i>=0;i--)
    {
        raspuns.push_back(ans2[i]);
    }
    for(i=ans2.size()-1;i>pz2;i--)
    {
        raspuns.push_back(ans2[i]);
    }
}
vector<int> longest_trip(int N, int D)
{
    int i,n=N,capst1,capdr1,capst2,capdr2;
    ans1.clear();
    ans2.clear();
    raspuns.clear();
    if(are_connecte(0,1)==1)
    {
        capst1=0;
        capdr1=1;
        dq1.push_front(1);
        dq1.push_front(0);
    }
    else
    {
        capst1=0;
        capdr1=0;
        capst2=1;
        capdr2=1;
        dq2.push_front(1);
        dq1.push_front(0);
    }
    for(i=2;i<n;i++)
    {
        if(dq2.size()==0)
        {
            capst2=i;
            capdr2=i;
            dq2.push_front(i);
        }
        else
        {
            if(are_connecte(i,capst1)==1)
            {
                capst1=i;
                dq1.push_front(i);
            }
            else if(are_connecte(i,capst2)==1)
            {
                capst2=i;
                dq2.push_front(i);
            }
            else
            {
                capst1=capdr2;
                while(dq2.size())
                {
                    dq1.push_front(dq2.front());
                    dq2.pop_front();
                }
                capst2=i;
                capdr2=i;
                dq2.push_front(i);
            }
        }
    }
    while(dq1.size())
    {
        ans1.push_back(dq1.front());
        dq1.pop_front();
    }
    while(dq2.size())
    {
        ans2.push_back(dq2.front());
        dq2.pop_front();
    }
    if(ans2.size()>ans1.size())
    {
        swap(ans1,ans2);
    }
    if(are_connected(ans1,ans2)==0)
    {
        return ans1;
    }
    else
    {
        int a,b,c,d;
        a=ans1[0];
        b=ans1.back();
        c=ans2[0];
        int gay=1;
        if(are_connecte(a,c)==1 && gay==1)
        {
            reverse(ans1.begin(),ans1.end());
            for(i=0;i<ans2.size();i++)
            {
                ans1.push_back(ans2[i]);
            }
            return ans1;
        }
        else if(are_connecte(b,c)==1 && gay==1)
        {
            for(i=0;i<ans2.size();i++)
            {
                ans1.push_back(ans2[i]);
            }
            return ans1;
        }
        else
        {
            vector<int>pl2;
            if(ans2.size()>=2)
            {
                d=ans2.back();
                if(are_connecte(a,d))
                {
                    for(i=0;i<ans1.size();i++)
                    {
                        ans2.push_back(ans1[i]);
                    }
                    return ans2;
                }
                int st=0,dr=ans2.size()-1;
                while(st<=dr)
                {
                    pl2.clear();
                    int mij=(st+dr)/2;
                    for(i=0;i<=mij;i++)
                    {
                        pl2.push_back(ans2[i]);
                    }
                    if(are_connected(pl2,ans1)==1)
                    {
                        dr=mij-1;
                    }
                    else
                    {
                        st=mij+1;
                    }
                }
                solus(ans2[dr+1],dr+1);
                return raspuns;
                /*
                for(i=0;i<ans2.size();i++)
                {
                    pl2.clear();
                    pl2.push_back(ans2[i]);
                    if(are_connected(pl2,ans1))
                    {
                        solus(ans2[i],i);
                        return raspuns;
                    }
                }*/
            }
            else
            {
                solus(ans2[0],0);
                return raspuns;
            }
        }
    }
}

Compilation message (stderr)

longesttrip.cpp: In function 'void solus(int, int)':
longesttrip.cpp:21:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for(i=0;i<ans1.size();i++)
      |             ~^~~~~~~~~~~~
longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:130:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  130 |             for(i=0;i<ans2.size();i++)
      |                     ~^~~~~~~~~~~~
longesttrip.cpp:138:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  138 |             for(i=0;i<ans2.size();i++)
      |                     ~^~~~~~~~~~~~
longesttrip.cpp:152:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  152 |                     for(i=0;i<ans1.size();i++)
      |                             ~^~~~~~~~~~~~
longesttrip.cpp:48:22: warning: variable 'capdr1' set but not used [-Wunused-but-set-variable]
   48 |     int i,n=N,capst1,capdr1,capst2,capdr2;
      |                      ^~~~~~
longesttrip.cpp: In function 'void solus(int, int)':
longesttrip.cpp:29:10: warning: 'pen' may be used uninitialized in this function [-Wmaybe-uninitialized]
   29 |     for(i=pen-1;i>=0;i--)
      |         ~^~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 30 / 60